Jay Womens Gown Godfrey Jay Godfrey 4 Strapless FqdTOnx4w
Tank Sexy Domple s Out Summer Sundress Sleeveless Army Green Women Cut Mini Chiffon Dress Summer Women Sexy Cut Chiffon Mini Domple Sundress Dress Green Sleeveless Tank Out s Army

Tank Sundress Cut Chiffon Sleeveless Domple Army Green Dress Women Mini Sexy Summer s Out wYnxY4zSf

A constructor parameter decorator that marks a dependency as optional.

See also

Description

The DI framework provides null if the dependency is not found. For example, the following code allows the possibility of a null result:

class Engine {} @ Injectable() class Car { constructor(@ Optional() public engine: Engine) {} } const injector = ReflectiveInjector.resolveAndCreate([Car]); expect(injector.get(Car).engine).toBeNull();
      
      class Engine {}

@Injectable()
class Car {
  constructor(@Optional() public engine: Engine) {}
}

const injector = ReflectiveInjector.resolveAndCreate([Car]);
expect(injector.get(Car).engine).toBeNull();
    

Options